KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 15. N:0 7. 25 



Hdbitat. Jalmal, about 72° 20' n. under möss (?), at least fragments of such were 

 found among the specimens. 



However carefully I searched for the efferent duct I could not find it anywhere, 

 which fact I must attribute either to that organ not being developed at the tirne or, 

 it being of such diminutive size as to have been overlooked. 



This species is easily distinguished from its allied species through the shape of 

 the cerebral ganglion, the form of the receptacle, the presence of large perigastric cells 

 etc. From A. tenellus and Levinseni it is distinguished through the characteristics of 

 the genus, through the size of its body, through the number and length of the spines 

 and from the latter species through its perigastric of bodies. It is peculiar that the 

 species of two different genera resemble each other in so many of their characters, 

 which in this case at least cannot in any way be explained by mimicry or similar 

 external conditions, but points to descent and evolution. 



2. Neoenchytraeus Tejdovskyi n. sp. 

 Pl. X. Fig. 19. 



The supra-cesophagial ganglion is nearly twice as long as broad (fig. 19, f). 



The receptacle consists of a twisted säck, the tube being short and narrow, tape- 

 ring downwards or towards the external orifice, and is here surrounded all along its 

 whole length by numerous glands (fig. 19, g). 



The efferent duct. The vesicle assumes the shape of a partially twisted bag. 

 The tube is wound very characteristically, and extends itself through several segments 

 behind the cingulum, towards the end of the body (fig. 19, h). 



The outer duct of the segmental organs is of the same length as the middle 

 lobe and pressed closely towards it. The inner duct is very short and not much lon- 

 ger than the width ot the outer one. These organs very much resemble those of the 

 following species, the only difference being perhaps that the outer tube is a little 

 shorter and thicker than the same tube of JV". Stuxbergi (fig. 36). 



The perigastric cells are smaller than those of the preceding species, but also 

 more translucent and their substance is more granular. They are very scarce. 



The ovaries are very large in the segments 11 and 12. 



The testes in the 8 th , 9 th and 10 th segments. 



The spines are of equal length in each fascicle 3. 4. 4. 3. 



The length of the body about 20 m. m. 



The width of the same about 1 m. m. 



The number of segments about 56, not very well defined. 



The colour whitish opacpae. 



Habitat. The only locality where this species was found is the »Auk-mountain» at 

 Besimenaja in Novaja Semlia about lat. 72° 55' n. 



K. Sv. Vet. Ak. Handl. Baiirt. 15. N:o 7. ■* 



